Abstract
Mid-ocean ridge basalts (MORB) are characterized by 3He/4He ratios between 6 9 RA (RA is the atmospheric ratio of 1.39x 10-6). This study compares helium isotope ratios for MORB from a variety of ridges around the world, but focuses primarily on two areas which have been studied in detail; the East Pacific Rise from 5-16~ and two ridge segments at 26~ and 33~ on the MidAtlantic Ridge. Systematic relationships exist in these areas between helium and other isotope systems such as strontium and lead. Also, an inverse correlation exists between spreading rate and the variance of He isotopes for most ridges away from the influence of high 3He hotspots such as Iceland and Easter.
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